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+<div class="section">
+
+ThinkPad R400 {#pagetop}
+=============
+
+It is believed that all or most R400 laptops are compatible. See notes
+about [CPU
+compatibility](../install/r400_external.html#cpu_compatibility) for
+potential incompatibilities.
+
+There are two possible flash chip sizes for the R400: 4MiB (32Mbit) or
+8MiB (64Mbit). This can be identified by the type of flash chip below
+the palmrest: 4MiB is SOIC-8, 8MiB is SOIC-16.
+
+**The R400 laptops come with the ME (and sometimes AMT in addition)
+before flashing libreboot. Libreboot disables and removes it by using a
+modified descriptor: see [gm45\_remove\_me.html](gm45_remove_me.html)**
+(contains notes, plus instructions)
+
+Flashing instructions can be found at
+[../install/\#flashrom](../install/#flashrom)
+
+[Back to previous index](./).
+
+</div>
+
+<div class="section">
+
+EC update {#ecupdate}
+=========
+
+It is recommended that you update to the latest EC firmware version. The
+[EC firmware](https://libreboot.org/faq/#firmware-ec) is separate from
+libreboot, so we don\'t actually provide that, but if you still have
+Lenovo BIOS then you can just run the Lenovo BIOS update utility, which
+will update both the BIOS and EC version. See:
+
+-   <https://libreboot.org/docs/install/index.html#flashrom>
+-   <http://www.thinkwiki.org/wiki/BIOS_update_without_optical_disk>
+
+NOTE: this can only be done when you are using Lenovo BIOS. How to
+update the EC firmware while running libreboot is unknown. Libreboot
+only replaces the BIOS firmware, not EC.
+
+Updated EC firmware has several advantages e.g. bettery battery
+handling.
+
+</div>
+
+<div class="section">
+
+Compatibility (without blobs) {#compatibility_noblobs}
+-----------------------------
+
+<div class="subsection">
+
+### Hardware virtualization (vt-x) {#hwvirt}
+
+The R400, when run without CPU microcode updates in coreboot, currently
+kernel panics if running QEMU with vt-x enabled on 2 cores for the
+guest. With a single core enabled for the guest, the guest panics (but
+the host is fine). Working around this in QEMU might be possible; if
+not, software virtualization should work fine (it\'s just slower).
+
+On GM45 hardware (with libreboot), make sure that the *kvm* and
+*kvm\_intel* kernel modules are not loaded, when using QEMU.
+
+The following errata datasheet from Intel might help with investigation:
+<http://download.intel.com/design/mobile/specupdt/320121.pdf>
+
+</div>
+
+</div>
+
+<div class="section">
+
+The R400 is almost identical to the X200, code-wise. See
+[x200.html](x200.html).
+
+TODO: put hardware register logs here like on the [X200](x200.html) and
+[T400](t400.html) page.
+
+</div>
+
+<div class="section">
+
+Copyright © 2014, 2015 Leah Rowe &lt;info@minifree.org&gt;\
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the Creative Commons Attribution-ShareAlike 4.0
+International license or any later version published by Creative
+Commons; A copy of the license can be found at
+[../cc-by-sa-4.0.txt](../cc-by-sa-4.0.txt)
+
+Updated versions of the license (when available) can be found at
+<https://creativecommons.org/licenses/by-sa/4.0/legalcode>
+
+UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE EXTENT
+POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS AND
+AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND
+CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, IMPLIED, STATUTORY,
+OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, WARRANTIES OF TITLE,
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+OF ERRORS, WHETHER OR NOT KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF
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+APPLY TO YOU.
+
+TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE TO YOU
+ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, NEGLIGENCE) OR
+OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL,
+PUNITIVE, EXEMPLARY, OR OTHER LOSSES, COSTS, EXPENSES, OR DAMAGES
+ARISING OUT OF THIS PUBLIC LICENSE OR USE OF THE LICENSED MATERIAL, EVEN
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+
+The disclaimer of warranties and limitation of liability provided above
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+</div>